Mac OS X has an option to keep hard drives spinning for quick file access, or to save power and reduce noise by spinning them down when they're not in use. This can be convenient, but is rather limiting for users who would like to customize when their

Donationware Cold Turkey restricts access to Facebook, Twitter, Gmail, Outlook, Solitaire, and any other sites and programs you choose, and at times you set. Free app Focus Booster takes a kinder, gentler approach.